Once you know the engine size, you should consult your owner's manual or a reliable parts website like AutoZone, Advance Auto Parts, or Napa Auto Parts. These websites allow you to enter your vehicle's year, make, and model (and engine size) to find the recommended spark plugs. The manufacturer's recommendation is always the best starting point.
While many brands make suitable spark plugs, Champion, NGK, and Bosch are all reputable brands often recommended for Jeep Liberties. However, don't just pick a brand, find the *specific part number* recommended for your engine. Using the wrong type of spark plug can damage your engine.
